This may, or may not, help budding writers: What is the best way to edit your manuscript? Here’s my take, based on the experience of two novels:
Step 1: Finish your Manuscript, then throw it aside for a few weeks. Return to it and read it through, noting obvious errors. Each time you step away from your manuscript you come back to it from a fresh perspective. Note: your first draft is always (yes, always) inadequate.
Step 2: Use an Online Editor. I like using prowritingaid or, more recently, grammarly. Both of these help identify issues such as repeated phrases, over-use of adverbs, sentence lengths, etc. I don’t recommend paying a subscription service, unless for a short period (e.g. a month) in order to check your entire manuscript. A feature I liked as the one where (in prowritingaid) where you can compare your style to another author. You may not be a Hemingway fan, but I like the simplicity of checking chapters in the Hemingway app. Here’s an example from my new novel (with the Hemingway result alongside);

Step 3: Join a Writing Circle. This is, I’m my humble opinion, the MOST important step. Get a writing-circle to review your work. This circle should consist of other writers or readers in your genre who will give constructive advice and not hold back on any criticism. For example, one of my fellow writers gave such good feedback that I rearranged my chapter order, changed the ending, and built a more authentic and powerful plot. And I was able to reciprocate and also offer him advice on his new book.
Step 4: Find a Professional Editor. There are many people who have experience in the publishing trade who are happy to review your work. I used one to check my submission trio – the Query Letter, Synopsis, and first three chapters. Their fixes and recommendations were so good that I asked them to check over other key chapters in my novel. What I especially liked was an experienced editor’s positive encouragement with, “I have a good feeling about this book.” Now, I just need a literary agent to agree.
Final Note: Don’t let any of the above steps change your own writing style. Stay true to who you are as a writer and use the steps to improve your style, rather than force it into someone else’s.